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MANUFACTURE, OF KEY BLANKS. No. 401,247. Patented Apr. 9, 1889.

UNITED STATES PATENT CEEIcE.

CHARLES M. BURGESS, OF NEW BRITAIN, CONNECTICUT, ASSIGNOR TO THE RUSSELL 85 ERIVIN MANUFACTURING COMPANY, OF SAME PLACE.

MANUFACTURE OF KEY-BLANKS.

SPECIFICATION forming part of Letters Patent No. 401,247, dated April 9, 1889.

Application filed February 16, 1889. Serial No. 300,159. (No model.)

To all whom it may concern:

Be it known that I, CHARLES M. BURGESS, a citizen of the United States, residing at New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in the Manufacture of Key-Blanks, of which the following is a specification.

My invention relates to improvements in the manufacture of key-blanks from a single piece of metal and the objects of my improvement are economy in labor and stock and to enable the key to be made from bars of homogeneous steel. e I

In the accompanying drawings, Figure 1 illustrates in side elevation the result of the first step in my process. Fig. 1 is a transverse section of the bar from which the headed blank, Fig. 1, is formed. Fig. 2 is a side elevation of the result of the second step, Fig. 3 the third, and Fig. l the fourth step; and Fig. 5 is a side elevation of the result of the first step with the amount of cutting to be done by the second step indicated thereon in broken lines.

In the practice of my invention I take a rectangular bar of homogeneous steel, place it in a heading-machine, and upset one end thereof to thicken it and also to throwthe stock in an edgewise direction toward one side, the headed portion of the bar being designated by 6 in Figs. 1, 2, and 5. The stock may be out into suit-able lengths when in the heading-machine, or before heading, as may be desired. I next out that edge of the stock which has the least sidcwise projection at the headed end 6 by means of dies which cut from said edge the two pieces 7 and 8, (indicated by broken lines in Fig. 5,) and thereby trim the metal into a form that approximates the general contour of a key. (Shown in Fig. 2.) The sidewise projection of the head 6 should throw the stock sufliciently toward the back edge of the key-blank (the back being the upper edge in the several views) to furnish sufficient stock on that edge for forming the ordinary handle, 9, Figs. 3 and l. The result of the second step, Fig. 2, is then placed between swaging dies having depressions which correspond to the form of the desired key, and the metal is swaged into the form shown in Fig. 3, thereby forming the handle 9, shank 10, stem 11, and bit 12, but leaving a projecting fin, 13, as shown in Fig. 3. The key is then placed in a trimming-die of the proper contour and the surplus metal cut oif to produce the complete key-blank, Fig. 4., which blank may be finished in any ordinary manner.

Ihave herein illustrated a key with a round shank and a shoulderless stem; but it is evident that other known forms of keys may be produced by my process by the employment of swaging-dies correspondingly shaped.

I claim as my invention- That improvement in the manufacture of keys which consists in heading the stock at one end, cutting out portions of said headed blank to give the general contour of a key, then swaging it into the form of the desired key, and then removing the surplus metal, substantially as described, and for the purpose specified.

CHAS. M. BURGESS.

\Vitnesses:

THOS. S. BISHOF, M. S. WIARD. 

